def make_dsn()

in xray-setup/psycopg2/extensions.py [0:0]

• 20 lines of code
• 7 McCabe index (conditional complexity)

def make_dsn(dsn=None, **kwargs):
    """Convert a set of keywords into a connection strings."""
    if dsn is None and not kwargs:
        return ''

    # If no kwarg is specified don't mung the dsn, but verify it
    if not kwargs:
        parse_dsn(dsn)
        return dsn

    # Override the dsn with the parameters
    if 'database' in kwargs:
        if 'dbname' in kwargs:
            raise TypeError(
                "you can't specify both 'database' and 'dbname' arguments")
        kwargs['dbname'] = kwargs.pop('database')

    # Drop the None arguments
    kwargs = {k: v for (k, v) in kwargs.items() if v is not None}

    if dsn is not None:
        tmp = parse_dsn(dsn)
        tmp.update(kwargs)
        kwargs = tmp

    dsn = " ".join(["%s=%s" % (k, _param_escape(str(v)))
        for (k, v) in kwargs.items()])

    # verify that the returned dsn is valid
    parse_dsn(dsn)

    return dsn